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Polymer crystallization in 25-nm spheres

Loo¹, Register, Ryan

¹Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544-5263, USA.

Physical Review Letters

|September 16, 2000

Summary

Crystallization in block copolymer spheres maintains ordered structures. This process shows first-order kinetics, differing from bulk polymer crystallization.

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Area of Science:

Polymer Science
Materials Science
Physical Chemistry

Background:

Block copolymers self-assemble into ordered nanostructures (mesophases) in the melt.
Understanding crystallization behavior within these confined microdomains is crucial for material properties.

Purpose of the Study:

To investigate the crystallization process within the discrete spherical domains of a block copolymer mesophase.
To determine the kinetics and structural evolution during crystallization under confinement.

Main Methods:

Time-resolved X-ray scattering was employed to monitor crystallization in situ.
The study focused on a block copolymer system with cubic microdomain packing.

Main Results:

The cubic packing of microdomains was preserved during crystallization, driven by strong interblock segregation.
Crystallization occurred via homogeneous nucleation within each sphere, leading to isothermal processes.
The observed crystallization kinetics followed first-order kinetics.

Conclusions:

Confined crystallization within block copolymer spheres preserves mesophase order.
Homogeneous nucleation and first-order kinetics characterize this confined crystallization, distinct from bulk polymer behavior.

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